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• W157726104 abstract "Fish assemblages at the reach scale within a river network are structured relative to local abiotic factors that are, in turn, constrained at the larger scales of the valley segment or catchment. While abiotic factors important to fish assemblages at the reach scale are well understood, studies of larger scale constraints have yielded variable conclusions, spurring a need for further studies in new settings and biogeographic contexts. This study investigated the relative importance of catchmentand reach-scale abiotic factors to variation in fish assemblage composition in rivers of northeastern Mesoamerica. I assembled catchment and reach environment, and fish datasets for 72 sampling sites on main stem rivers of 12 of the 16 major watersheds draining to the coast of Belize. Partial canonical correspondence analysis was used to determine the unique effects of catchmentand reach-level descriptors on fish presence and absence, relative abundance, and community summary metrics. Results showed that, combined, catchment and reach variables explained a large portion of the total variation in the fish assemblage data (57 to 73%), and that catchment environment explained a greater portion of variation (24 to 26%) than reach environment (9 to 20%). Variables representing landscape position (local elevation, watershed area) and its reach-level correlates (channel width, depth variation, and substrate composition) related most strongly to the fish assemblage data. The results suggest that landscape-scale factors have a stronger relative influence on assemblages than environmental conditions at the reach scale. These results contrast with past findings, and suggest that biodiversity conservation efforts must aim to protect ecological integrity across a positional gradient from the mountains to the sea, and that the catchment scale or larger is a biologically meaningful scale for fish conservation planning and coordination to begin in northeastern Mesoamerica." @default.
• W157726104 created "2016-06-24" @default.
• W157726104 creator A5014209424 @default.
• W157726104 date "2009-01-01" @default.
• W157726104 modified "2023-09-25" @default.
• W157726104 title "Fish Communities and Conservation of Aquatic Landscapes in Northeastern Mesoamerica." @default.
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